What are the types of engine fuel injection besides direct injection?

[VanRuth]

Engines are categorized into three types: direct injection, single-point injection, and multi-point injection. Introduction to engines: An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (such as Stirling engines, steam engines, etc.), jet engines, electric motors, and more. Engine cylinder arrangement: Cylinder arrangement, as the name suggests, refers to the layout of cylinders in a multi-cylinder internal combustion engine. Simply put, it describes the queue formation of cylinders on an engine.